Jussi Suomela, Tomi Ylikorpi. Ball-Shaped Robots: An Historical Overview and Recent Developments at TKK. In Peter I. Corke, Salah Sukkarieh, editors, Field and Service Robotics, Results of the 5th International Conference, FSR 2005, July 29-31, 2005, Port Douglas, QLD, Australia. Volume 25 of Springer Tracts in Advanced Robotics, pages 343-354, Springer, 2005. [doi]